Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0f17f2097c73af…

MALICIOUS

PDF

89.4 KB Created: 2021-08-24 01:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6970c2c866602963c4e835b2fed9c7d0 SHA-1: f61c68b0601a9fe5f75d15e76907ad6c12b75c73 SHA-256: 8d0f17f2097c73afdd71d6f1439ce9b33a3a9b8fbfc43edf22e4249bc82e4b50
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users. The heuristic 'SE_SECURITY_BYPASS' indicates the document attempts to trick the user into disabling security software, a common tactic in phishing and malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=anxiety+and+internal+tremors PDF link annotation
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609f99bf7ff0f---fejelitelodemut.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a07f46b7f414f1790dfeb5f3e006b596/wapubonopaputo.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbce99a50a---tavejimubekuzelu.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210810114808.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///gunezilebimapezavelesuv.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/mamejow.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/829aafa0e0c11cbf723d390aa12d5f68/54251264378.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/88cc0ffc607cebe3464e3dc18fb1afd2/toviwisorajepise.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/73459629184.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/65756679226.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/wezepafuvifotixawudu.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/mipira.pdfIn PDF document text
    • http://cutskytools.com/d/files/8114156091.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/79022680768.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc1de479a---fexopopoderodidaligapawig.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/wavifu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4a6791ec6---movex.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/jepupazijowujaw.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/10b57276a51aae48d76fb821bc98d310/jerizasekutuw.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/28b2e36472e8139f8aa3819d91dbdf7e/wubofusi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805c6c77525---bozemaxafove.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/45785057160.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/leramoverimenovebo.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/togebimogiwape.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 17532 bytes
SHA-256: 56d58df8867b01bcf39017695a23c58695af0e2999f224e4f68f31321281e1c7
font_01_sfnt_off0001261b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261B 10608 bytes
SHA-256: 6d49bcb3947d8730073f41953eb79304bcae77919e4727c691b9386b00a3ce1c
font_02_sfnt_off00013e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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